PHP count_chars function

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count_chars

(PHP 4, PHP 5)

Counts the number of occurrences of every byte-value (0..255) in
string and returns it in various ways.
The optional parameter mode defaults to
0. Depending on mode
count_chars() returns one of the following:

0 – an array with the byte-value as key and the frequency of
every byte as value.

1 – same as 0 but only byte-values with a frequency greater
than zero are listed.

2 – same as 0 but only byte-values with a frequency equal to
zero are listed.

3 – a string containing all used byte-values is returned.

4 – a string containing all not used byte-values is returned.

Example 1. count_chars() example

$data = "Two Ts and one F.";
 
foreach (count_chars($data, 1) as $i => $val) {
   echo "There were $val instance(s) of \"" , chr($i) , "\" in the string.\n";
}

The above example will output:

See also strpos() and
substr_count().